<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>盒子模型</title>
    <style>
        div {
            width: 200px;
            height: 200px;
            border-color: aqua;
            border-style: dotted;
        }
    </style>

</head>

<body>

    <div>

    </div>




</body>

</html>